<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="UserLoginServlet" method="post">
        账户：<input type="text" name="username" value="admin"><br>
        密码：<input type="text" name="pass" value="123"><br>
        <input type="submit" value="登录">
    </form>

</body>
</html>